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Texas Instruments TPS5405DR
- Part No.:
- TPS5405DR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS5405DR.pdf
- Description:
- IC REG BUCK 5V 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,986
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Product details
Overview
TPS5405DR from Texas Instruments is a monolithic non-synchronous step-down (buck) regulator with integrated high-side N-channel MOSFET, delivering fixed 5-V output at up to 2-A continuous load current across 6.5-V to 28-V input range. It employs peak current-mode control, features pulse-skipping mode for light-load efficiency (>80% at 10 mA), and supports programmable switching frequency (50 kHz–1.1 MHz) via ROSC pin.
For engineers reviewing the TPS5405DR datasheet, TPS5405DR pinout, TPS5405DR application, or TPS5405DR equivalent, key selection criteria include its SOIC-8 package, 120-mΩ high-side RDS(on), 120-kHz default switching frequency (ROSC open), thermal shutdown at 165°C, and external soft-start capability - all critical for industrial power supply, consumer electronics, and distributed 9/12/24-V system designs.
Technical Context
The TPS5405DR implements constant-frequency peak current-mode control with internal slope compensation to stabilize operation above 50% duty cycle and reduce external compensation complexity. Its error amplifier (92 µA/V transconductance) drives the PWM comparator using VSENSE feedback referenced to a 0.8-V internal bandgap, enabling ±2% initial output voltage accuracy.
Protection architecture includes cycle-by-cycle overcurrent limiting (2.5-A typical peak inductor current limit), frequency foldback during overload, switching node anti-ringing circuitry to suppress LC resonance-induced EMI, and overvoltage transient protection that disables the high-side FET when VSENSE exceeds 109% of reference. Thermal shutdown triggers at 165°C junction temperature with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5 V to 28 V - supports wide-range industrial and automotive battery-derived supplies without pre-regulation. |
| Output Voltage | Fixed 5 V ±2% - eliminates external resistor divider, simplifies layout and improves stability in 5-V rail applications. |
| Max Output Current | 2 A continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs in embedded systems. |
| Switching Frequency | 120 kHz (ROSC open) - balances efficiency, EMI, and external component size; adjustable from 50 kHz to 1.1 MHz. |
| High-Side RDS(on) | 120 mΩ (typ) - enables high-efficiency conversion at mid-load; reduces heat dissipation vs. discrete solutions. |
| Light-Load Efficiency | >80% at 10 mA - achieved via pulse-skipping mode, extending battery life in standby or low-power states. |
| Thermal Shutdown | 165°C trip point - provides robust fault protection without requiring external thermal monitoring circuitry. |
Pinout & Package
TPS5405DR is housed in an 8-pin SOIC (D) package with standard JEDEC outline, 1.75-mm max height, and RoHS-compliant NiPdAu lead finish. The package supports surface-mount assembly with MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap capacitor connection | Requires 0.1-µF ceramic cap between BOOT and LX to generate gate drive voltage for internal high-side MOSFET. |
| VIN | Main input supply | Accepts 6.5–28 V; powers internal circuitry and high-side driver; UVLO activates at 3.5 V (200-mV hysteresis). |
| ROSC | Frequency programming | Leaving open sets 120-kHz switching frequency; resistor to GND adjusts frequency from 50 kHz to 1.1 MHz. |
| SS | Soft-start control | External capacitor (e.g., 10 nF) sets output ramp time; internal 2-µA current source charges SS pin. |
| VSENSE | Output voltage feedback | Monitors regulated 5-V output via resistive divider (not required for fixed-output version); reference = 0.8 V. |
| COMP | Error amplifier output | Connects to external RC compensation network; transconductance = 92 µA/V; clamped at 2.1 V max. |
| GND | Power ground | Common return path for VIN, LX, and internal circuits; must be low-impedance connection to minimize noise. |
| LX | Switching node | Connects to external inductor; internal anti-ringing circuit activates at zero-crossing to damp LC resonance. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping mode | Activates below ~300 mA load to maintain >80% efficiency at light loads, reducing quiescent power to 100 µA. |
| Integrated boot diode | Eliminates need for external bootstrap diode, simplifying BOM and improving reliability in high-duty-cycle operation. |
| Switching node anti-ringing | Internal MOSFET between LX and VSENSE damps parasitic LC oscillation, lowering radiated EMI without snubbers. |
| Overvoltage transient protection | Disables high-side FET if VSENSE exceeds 109% × 0.8 V (0.872 V), preventing output overshoot during fault recovery. |
| Frequency spread spectrum | ±6% jitter around nominal fSW with 1/512 swing frequency - reduces EMI peak amplitude without affecting regulation. |
Applications
| Industrial Power Supplies | Consumer Electronics |
|---|---|
Use Scenario: Distributed 24-V DC bus powering PLC I/O modules, sensors, and actuators in factory automation. IC Role / Device Role / Timing Role: Primary non-isolated buck converter generating stable 5-V logic rail from unregulated 24-V supply. Use Value: Wide 6.5–28-V input accommodates brownout and surge conditions; 2-A output supports multiple downstream loads. | Use Scenario: Power management in set-top boxes and LCD monitors with variable input from wall adapters or PoE injectors. IC Role / Device Role / Timing Role: Fixed-output DC-DC regulator supplying 5-V USB peripherals, HDMI interface ICs, and display controllers. Use Value: Pulse-skipping mode extends standby efficiency; SOIC-8 footprint enables compact PCB layout in space-constrained enclosures. |
| Automotive Infotainment | Battery-Powered Test Equipment |
Use Scenario: 12-V vehicle battery powering head unit audio processors, touch controllers, and memory subsystems. IC Role / Device Role / Timing Role: Input-stage buck regulator converting noisy 12-V battery rail to clean 5-V supply for digital ICs. Use Value: UVLO (3.5 V) ensures reliable startup during cranking; thermal shutdown protects against under-hood overheating. | Use Scenario: Portable handheld test instruments powered by Li-ion batteries (8–12.6 V) requiring regulated 5-V for MCU and ADC. IC Role / Device Role / Timing Role: High-efficiency buck converter maintaining 5-V rail across full battery discharge curve. Use Value: 120-mΩ RDS(on) minimizes dropout at low VIN; 100-µA quiescent current extends runtime in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54060DR | Wider 3.5–60-V input range; 0.5-A output; same SOIC-8 package and pinout. | Targeted at higher-input industrial or automotive systems where 28-V max is insufficient. | Select when input exceeds 28 V; not drop-in due to lower current rating and different UVLO threshold. |
| LM2678-5.0 | Fixed 5-V output; 5-A capability; requires external bootstrap diode; TO-220-5 package. | Suitable for higher-current, through-hole designs where thermal mass and heatsinking are available. | Choose for >2-A loads or legacy through-hole assembly; incompatible pinout and larger footprint than TPS5405DR. |
Compared with TPS54060DR and LM2678-5.0, the TPS5405DR uniquely balances 2-A output, 28-V max input, SOIC-8 integration, and pulse-skipping efficiency - making it optimal for mid-power 5-V systems where board space and light-load performance are prioritized over ultra-wide input or high-current capability.
Availability
TPS5405DR is available at Aetrix Electronics and suitable for industrial power supplies, consumer electronics, automotive infotainment systems, and battery-powered test equipment requiring stable component supply and long-term production continuity.
Supply support for TPS5405DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The TPS5405DR belongs to TI's SWIFT™ family of integrated DC-DC regulators, designed specifically for cost-sensitive, space-constrained applications needing fixed-output, high-efficiency buck conversion without complex external components.
FAQ
What is the default switching frequency of the TPS5405DR and how is it set?
The TPS5405DR defaults to 120 kHz when the ROSC pin is left floating (open). This frequency is factory-trimmed and does not require an external resistor. If a different frequency is needed - such as 300 kHz - an 85.5-kΩ resistor must be connected from ROSC to GND. The TPS5405DR datasheet confirms this behavior in both the "Ordering Information" and "Oscillator" sections, and the functional block diagram shows ROSC as the sole frequency programming terminal.
Does the TPS5405DR require an external bootstrap diode?
No, the TPS5405DR integrates the bootstrap diode internally, eliminating the need for an external component. A 0.1-µF ceramic capacitor must still be placed between BOOT and LX pins to provide gate drive voltage for the high-side MOSFET. This integration reduces BOM count and improves reliability compared to discrete bootstrap solutions - a key feature explicitly stated in the "Overview" and "Detailed Description" sections of the TPS5405DR datasheet.
What is the maximum continuous output current supported by the TPS5405DR?
The TPS5405DR supports up to 2 A of continuous output current under recommended operating conditions (TA = –40°C to 85°C, proper PCB thermal design). This rating is confirmed in the "Features" section ("Up to 2-A Maximum Continuous Output Loading Current") and reinforced by the "Electrical Characteristics" table, which specifies a 2.5-A typical peak inductor current limit - providing margin for transient loads. Derating applies above 85°C ambient per the thermal metrics (θJA = 116.7°C/W).
How does the TPS5405DR achieve high efficiency at light loads?
The TPS5405DR achieves high light-load efficiency (>80% at 10 mA) by entering pulse-skipping mode when peak inductor current drops below ~300 mA. In this mode, the COMP pin voltage is clamped at 0.5 V, disabling switching cycles until output droop triggers regulation. This reduces switching losses and quiescent current to 100 µA (non-switching), as verified in the "Features", "Electrical Characteristics", and "Detailed Description" sections of the TPS5405DR datasheet.
What protection features are built into the TPS5405DR?
The TPS5405DR includes cycle-by-cycle overcurrent protection (trip at ~2.5 A), thermal shutdown at 165°C, input UVLO (3.5 V with 200-mV hysteresis), overvoltage transient protection (disables high-side FET if VSENSE > 0.872 V), and switching node anti-ringing circuitry. These protections are documented in the "Features", "Functional Block Diagram", "Absolute Maximum Ratings", and "Detailed Description" sections - ensuring robust operation in real-world fault conditions without external supervision.
TPS5405DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 50kHz ~ 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS5405DR FAQ
1.How can I place an order for TPS5405DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS5405DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS5405DR reliable?
The price and inventory of TPS5405DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS5405DR is usually 5 days.
3.What payment methods are accepted for TPS5405DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS5405DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS5405DR?
TPS5405DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS5405DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS5405DR?
For technical support, including TPS5405DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS5405DR requirements.
6.How does Aetrix verify that TPS5405DR is sourced from the original manufacturer or authorized distributors?
All TPS5405DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS5405DR meets industry standards.
7.What is the process for return or replacement of TPS5405DR?
All TPS5405DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS5405DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS5405DR part is unused and in its original packaging.
Return procedure for TPS5405DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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